tests/spec/arb_gpu_shader_fp64/fs-non-uniform-control-flow-const.c

   1 /*
   2  * Copyright © 2016 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
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   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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  23
  24 /** @file fs-non-uniform-control-flow-const.c
  25  *
  26  * Checks that constant writes to double type variables in GLSL
  27  * work correctly when they are under non-uniform control flow.
  28  */
  29
  30 #include "piglit-util-gl.h"
  31
  32 PIGLIT_GL_TEST_CONFIG_BEGIN
  33         config.window_width = 62;
  34         config.window_height = 62;
  35         config.supports_gl_compat_version = 32;
  36         config.supports_gl_core_version = 32;
  37         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  38         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  39 PIGLIT_GL_TEST_CONFIG_END
  40
  41 static const char vs_pass_thru_text[] =
  42         "#version 130\n"
  43         "\n"
  44         "in vec4 piglit_vertex;\n"
  45         "void main() {\n"
  46         "        gl_Position = piglit_vertex;\n"
  47         "}\n";
  48
  49 static const char fs_source[] =
  50         "#version 150\n"
  51         "#extension GL_ARB_gpu_shader_fp64 : require\n"
  52         "\n"
  53         "out vec4 color;\n"
  54         "\n"
  55         "void main() {\n"
  56         "        int cx = int(gl_FragCoord.x) / 31;\n"
  57         "        int cy = int(gl_FragCoord.y) / 31;\n"
  58         "        dvec2 colord;\n"
  59         "        if ((cx + cy) % 2 == 0)\n"
  60         "                colord = dvec2(1.0lf, 0.0lf);\n"
  61         "        else\n"
  62         "                colord = dvec2(0.0lf, 1.0lf);\n"
  63         "        color = vec4(colord, 0, 1);\n"
  64         "}\n";
  65
  66 GLuint prog;
  67
  68 void
  69 piglit_init(int argc, char **argv)
  70 {
  71         piglit_require_extension("GL_ARB_gpu_shader_fp64");
  72
  73         prog = piglit_build_simple_program(vs_pass_thru_text, fs_source);
  74
  75         glUseProgram(prog);
  76
  77         glClearColor(0, 0, 0, 1);
  78
  79         if (!piglit_check_gl_error(GL_NO_ERROR))
  80                 piglit_report_result(PIGLIT_FAIL);
  81 }
  82
  83 enum piglit_result piglit_display(void)
  84 {
  85         bool pass = true;
  86         const int num_pixels = piglit_width * piglit_height;
  87         float *srcPixels = malloc(num_pixels * 4 * sizeof(float));
  88         float expected[4];
  89         int i, j;
  90
  91         glViewport(0, 0, piglit_width, piglit_height);
  92         glUseProgram(prog);
  93         glClear(GL_COLOR_BUFFER_BIT);
  94
  95         piglit_draw_rect(-1, -1, 2, 2);
  96
  97         glReadPixels(0, 0, piglit_width, piglit_height,
  98                      GL_RGBA, GL_FLOAT, srcPixels);
  99
 100         /* Verify */
 101         for (i = 0; i < piglit_height; i++) {
 102                 for (j = 0; j < piglit_width; j++) {
 103                         int cx = j / 31;
 104                         int cy = i / 31;
 105                         int pos = (i * piglit_width + j) * 4;
 106                         if ((cx + cy) % 2 != 0) {
 107                                 expected[0] = 0.0;
 108                                 expected[1] = 1.0;
 109                                 expected[2] = 0.0;
 110                                 expected[3] = 1.0;
 111                         } else {
 112                                 expected[0] = 1.0;
 113                                 expected[1] = 0.0;
 114                                 expected[2] = 0.0;
 115                                 expected[3] = 1.0;
 116                         }
 117
 118                         pass = piglit_compare_pixels(j, i, expected,
 119                                                      srcPixels + pos,
 120                                                      piglit_tolerance,
 121                                                      4) && pass;
 122                 }
 123         }
 124         piglit_present_results();
 125         free(srcPixels);
 126
 127         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 128 }